BtownGTI
n00b and a half
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« on: August 07, 2006, 10:33:00 PM » |
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Hey guys,
Few questions I have regarding lifters in the 20V. I have a AEB thats been ported polished mildy that has full ferrea VT goin in...valves, springs, retainers and seats. I'll be running a 248/258 Revolver cam with a gt30/40r. Now my concern is how high can I rev with the hydraulic lifters, considering the lag and having to wait for power, i wanna be able to rev this motor out to take advantage of the powerband. Also if in the future I decide to swap to solid lifters will my other VT components be reusable???
Look forward to some discussion; thanks guys,
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« Last Edit: August 07, 2006, 10:36:33 PM by DonR »
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Bastard
2.7t Masta
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« Reply #1 on: August 07, 2006, 11:03:23 PM » |
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gonna depend entirely on what those springs can do.
you are going to get some crazy top end with that hardware btw.
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v84lnch
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« Reply #2 on: August 08, 2006, 03:26:33 AM » |
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with the lift on the cams, you should have enough clearence.you should be ok to 8500. just make sure you run a heavy weight oil, and you should be fine. 0w40 minimum.
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i like dizzy deleting my posts.
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bobqzzi
Dyno Master Flex
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« Reply #3 on: August 09, 2006, 02:47:59 AM » |
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Hey guys,
Few questions I have regarding lifters in the 20V. I have a AEB thats been ported polished mildy that has full ferrea VT goin in...valves, springs, retainers and seats. I'll be running a 248/258 Revolver cam with a gt30/40r. Now my concern is how high can I rev with the hydraulic lifters, considering the lag and having to wait for power, i wanna be able to rev this motor out to take advantage of the powerband. Also if in the future I decide to swap to solid lifters will my other VT components be reusable???
Look forward to some discussion; thanks guys,
No one knows the answer to this that I know of. I don;t think valve float will be an issue- but I also don't know where the hydro lifters start misbehaving It is my educated guess that the lifters are going to start having problems at 8000 or so. |
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BtownGTI
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« Reply #4 on: August 09, 2006, 04:58:17 PM » |
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Ok Bob...so my next question is this...if i am only going to be hitting 8000rpm briefly in each gear in the 1/4 would the current setup be OK or would u recomend goin to a solid lifter setup??
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bobqzzi
Dyno Master Flex
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« Reply #5 on: August 10, 2006, 03:50:15 AM » |
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Ok Bob...so my next question is this...if i am only going to be hitting 8000rpm briefly in each gear in the 1/4 would the current setup be OK or would u recomend goin to a solid lifter setup??
I'd be inclined to dial it back to 7800 and call it good. Going to the expense of a solid lifter head to run 8000 seems a bit extravagant, If it is a drag only car, then you can get away with a lot of stuff that won;t fly in a daily driver. |
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BtownGTI
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« Reply #6 on: August 10, 2006, 06:14:38 AM » |
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it is a daily summer car (don't drive it in the Canadian Winter) but i dont abuse my car at all, I kill it maybe few times a week. If I do go solid id be inclined to push it to 8500+...just dont want to have a narrow powerband cuz of the size of the turbo.
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badger5
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« Reply #7 on: August 10, 2006, 10:12:13 PM » |
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My limiter has been set to 7800rpm for a number of years now and no ever had a hydro follower issue... UNTIL a coiuple of races ago. The motor got buzzed 3 races ago when the cable change rod end snapped off.. top of 2nd gear went for 3rd, cable snapped and it grabbed 1st again briefly... WEEEEEEEEEEEEEEEEEEEEEEEEEEEE went the motor for a second.
Motor ran ok afterwards, maybe not as crisp as before at the top end but not big difference. Did 2 x races and qualifications sicne the buzzed motor event. Was on a test day and it dropped a cylinder, just like a coil pack ,but not. mechanical dead #2 cyl.
Removed head and hydro lifter on one of the ex valve on #2 cyl was jacked open. would'nt close up.
Left head overnight on its side and it closed.
Stripped head anyhow as I was convinced I had stressed the valvegear when it got buzzed. hey presto, exhaust valve spring on #2 was broken. It had just started to slip and the hydro lifter had jacked up to max to make up the gap. Very very lucky to not have dropped a valve. - Now runs valve springs from Supertech, dual exhaust ones, Ti retainers blah blah blah...
The motor "buzz" event took it to 9500rpm-10,000rpm briefly I think from the gear calcs.
7800rpm has stood me fine for 35K miles previously, no follower issues at all.
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http://www.badger-5.comSEAT Ibiza Cupra-83mm JE pistons, Forged rods, largeport head, hybrid turbo, 3" DP & exhaust. Previously running 390-410bhp. To come a bigger hybrid turbo, catcams, 007 monstor mani, R32 t'body and some more custom code mapping.
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Bastard
2.7t Masta
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« Reply #8 on: August 10, 2006, 11:26:10 PM » |
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7800 on the stock hardware? impressive.
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badger5
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« Reply #9 on: August 11, 2006, 01:30:48 PM » |
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7800 on the stock hardware? impressive.
yep. for 35K miles, and a lot of them on track also. bone stock motor that was then 320atw retired the motor cos I built a new one with the right bits in it. still ran fine when it came out. |
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http://www.badger-5.comSEAT Ibiza Cupra-83mm JE pistons, Forged rods, largeport head, hybrid turbo, 3" DP & exhaust. Previously running 390-410bhp. To come a bigger hybrid turbo, catcams, 007 monstor mani, R32 t'body and some more custom code mapping.
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